Variations in number and morphology of permanent teeth in 7-year-old Swedish children

Int J Paediatr Dent. 2001 Jan;11(1):11-7. doi: 10.1046/j.1365-263x.2001.00205.x.

Abstract

Objectives: To establish the prevalence of numerical and morphological variations of permanent teeth in Swedish 7-year-olds and to accept or reject the hypothesis of a higher prevalence for these conditions in northern Sweden compared to other areas.

Design: Cross-sectional.

Setting: Department of Odontology/Pedodontics, Umeå University, Sweden.

Sample and methods: A total of 739 healthy Caucasian 7-year-olds residing in the city of Umeå, northern Sweden in 1976. The children were examined clinically and radiographically.

Results: The prevalence of hypodontia (excluding third molars) in girls was 8.4%, in boys 6.5%, and in both sexes combined 7.4%. Of the children with hypodontia, the majority (90.9%) lacked one or two teeth. Lower second premolars were the teeth most frequently missing. The prevalence of hyperdontia was 1.9%; 11 girls and three boys were affected; 78% of the supernumerary teeth were mesiodenses. Of the morphological variations, peg-shaped upper lateral incisors were found in 0.8% of the children, double-formation (gemination) in 0.3%, taurodontism in 0.3% and dens invaginatus in 6.8%. One diagnosis was found in 18% of the children, and in almost 8% of them more than one diagnosis was found.

Conclusions: The results agree with those obtained in similar populations and are considered representative of this ethnic group. The hypothesis of a genetically determined higher prevalence of numerical and morphological variations in the study population was not verified.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anodontia / epidemiology
  • Child
  • Cross-Sectional Studies
  • Dens in Dente / epidemiology
  • Female
  • Fused Teeth / epidemiology
  • Humans
  • Male
  • Prevalence
  • Sweden / epidemiology
  • Tooth Abnormalities / epidemiology*
  • Tooth Abnormalities / pathology
  • Tooth, Supernumerary / epidemiology